Taylor Kinney is an American actor and model, known for his starring role as Kelly Severide in NBC's Chicago Fire. He also starred as Mason Lockwood in The Vampire Diaries, as Glen Morrison in Trauma, and Luke Gianni in Fashion House. He's also appeared in films including Zero Dark Thirty, The Other Woman, and Here and Now. In 2011, Kinney was featured in Lady Gaga's music video "Yoü and I". Soon after, he and Lady Gaga started dating and they became engaged in February 2015, but ended up calling off their engagement in July 2016.

Taylor Kinney plays as Kelly Severide in Chicago Fire.
Taylor Kinney is the top #1 member of the cast and appears in 229 episodes.

David Eigenberg (born May 17, 1964) is an American actor. He is known for his role of Steve Brady on the HBO comedy Sex and the City.

David Eigenberg plays as Christopher Herrmann in Chicago Fire.
David Eigenberg is the top #2 member of the cast and appears in 229 episodes.

Joe Miñoso is an American theater and television actor, known for his starring role as Joe Cruz on NBC's Chicago Fire and as Moco Ruiz on Boss.

Joe Minoso plays as Joe Cruz in Chicago Fire.
Joe Minoso is the top #3 member of the cast and appears in 229 episodes.

Christian Stolte is an American actor known for his starring role as Randall 'Mouch' McHolland on NBC's Chicago Fire. He portrayed corrections officer Keith Stolte on the TV series Prison Break and Charles Makley in the film Public Enemies. He starred as chief appraiser David Kim Parker in The Onion's web series Lake Dredge Appraisal and as Frank Kohler on HBO's Boss. He's appeared in multiple films including Road to Perdition, Stranger Than Fiction, Leather heads, The Express, Public Enemies, Law Abiding Citizen, and A Nightmare on Elm Street (2010).

Christian Stolte plays as Randy 'Mouch' McHolland in Chicago Fire.
Christian Stolte is the top #4 member of the cast and appears in 229 episodes.

Eamonn Roderique Walker is an English film, television, and theatre actor. In the United States, he is known for playing Kareem Saïd in the HBO television series OZ, for which he won a CableACE Award, and Chief Wallace Boden on NBC's Chicago Fire. He also starred as Rev. Ephram Samuels on Kings and as Terence 'Edge' Edgecomb on The Whole Truth. He's appeared in films including Unbreakable, Tears of the Sun, Lord of War, Cadillac Records, and The Company Men. In England, he starred as PC Malcolm Haynes in The Bill and as Winston on the sitcom In Sickness and In Health.

Eamonn Walker plays as Wallace Boden in Chicago Fire.
Eamonn Walker is the top #5 member of the cast and appears in 229 episodes.

Jesse Gordon Spencer is an Australian actor and musician. He's known for his roles as firefighter Matthew Casey on Chicago Fire, Dr. Robert Chase on the medical drama House, and Billy Kennedy on the Australian soap-opera Neighbours.

Jesse Spencer plays as Matthew Casey in Chicago Fire.
Jesse Spencer is the top #6 member of the cast and appears in 195 episodes.

Kara Killmer is an actress, known for starring as Sylvie Brett in the NBC drama Chicago Fire. In 2010, she starred in the short-lived Hulu original reality web series If I Can Dream.

Kara Killmer plays as Sylvie Brett in Chicago Fire.
Kara Killmer is the top #7 member of the cast and appears in 183 episodes.

Yuriy Sardarov, is an Azerbaijani-born American actor and producer. He's known for his starring role as Brian 'Otis' Zvonecek on NBC's Chicago Fire until season 8. He's appeared in films including Argo (2012), The Double (2011), and The Ides of March (2011). He has also done extensive work in the theater.

Yuriy Sardarov plays as Brian 'Otis' Zvonecek in Chicago Fire.
Yuriy Sardarov is the top #8 member of the cast and appears in 159 episodes.

Monica Maria Raymund is an American actress, director and producer. She is known for her roles as Jackie Quiñones in the Starz crime drama Hightown, Gabriela Dawson in the NBC drama Chicago Fire, Dana Lodge in the CBS legal drama The Good Wife, and Maria "Ria" Torres in the Fox crime drama Lie to Me. She graduated from Juilliard in New York City. The character of Antonio Dawson (Jon Seda) on Chicago PD is sibling to the character of Gabriela Dawson on Chicago Fire.

Monica Raymund plays as Gabriela Dawson in Chicago Fire.
Monica Raymund is the top #9 member of the cast and appears in 137 episodes.

Miranda Rae Mayo is an American actress and former model, who starred as Lacey Briggs on Blood & Oil, as Talia Sandoval on Petty Little Liars, and, since 2016, stars on Chicago Fire as Stella Kidd.

Miranda Rae Mayo plays as Stella Kidd in Chicago Fire.
Miranda Rae Mayo is the top #10 member of the cast and appears in 137 episodes.